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140 lines
2.9 KiB
140 lines
2.9 KiB
20 years ago
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/*
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* linux/arch/arm/mach-footbridge/ebsa285-leds.c
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*
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* Copyright (C) 1998-1999 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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* EBSA-285 control routines.
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*
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* The EBSA-285 uses the leds as follows:
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* - Green - toggles state every 50 timer interrupts
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* - Amber - On if system is not idle
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* - Red - currently unused
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*
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* Changelog:
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* 02-05-1999 RMK Various cleanups
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/spinlock.h>
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#include <asm/hardware.h>
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#include <asm/leds.h>
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#include <asm/mach-types.h>
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#include <asm/system.h>
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#define LED_STATE_ENABLED 1
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#define LED_STATE_CLAIMED 2
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static char led_state;
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static char hw_led_state;
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static DEFINE_SPINLOCK(leds_lock);
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static void ebsa285_leds_event(led_event_t evt)
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{
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unsigned long flags;
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spin_lock_irqsave(&leds_lock, flags);
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switch (evt) {
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case led_start:
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hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN;
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#ifndef CONFIG_LEDS_CPU
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hw_led_state |= XBUS_LED_AMBER;
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#endif
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led_state |= LED_STATE_ENABLED;
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break;
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case led_stop:
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led_state &= ~LED_STATE_ENABLED;
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break;
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case led_claim:
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led_state |= LED_STATE_CLAIMED;
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hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
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break;
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case led_release:
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led_state &= ~LED_STATE_CLAIMED;
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hw_led_state = XBUS_LED_RED | XBUS_LED_GREEN | XBUS_LED_AMBER;
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break;
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#ifdef CONFIG_LEDS_TIMER
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case led_timer:
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state ^= XBUS_LED_GREEN;
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break;
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#endif
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#ifdef CONFIG_LEDS_CPU
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case led_idle_start:
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state |= XBUS_LED_AMBER;
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break;
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case led_idle_end:
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state &= ~XBUS_LED_AMBER;
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break;
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#endif
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case led_halted:
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if (!(led_state & LED_STATE_CLAIMED))
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hw_led_state &= ~XBUS_LED_RED;
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break;
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case led_green_on:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state &= ~XBUS_LED_GREEN;
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break;
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case led_green_off:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state |= XBUS_LED_GREEN;
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break;
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case led_amber_on:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state &= ~XBUS_LED_AMBER;
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break;
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case led_amber_off:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state |= XBUS_LED_AMBER;
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break;
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case led_red_on:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state &= ~XBUS_LED_RED;
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break;
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case led_red_off:
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if (led_state & LED_STATE_CLAIMED)
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hw_led_state |= XBUS_LED_RED;
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break;
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default:
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break;
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}
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if (led_state & LED_STATE_ENABLED)
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*XBUS_LEDS = hw_led_state;
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spin_unlock_irqrestore(&leds_lock, flags);
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}
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static int __init leds_init(void)
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{
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if (machine_is_ebsa285() || machine_is_co285())
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leds_event = ebsa285_leds_event;
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leds_event(led_start);
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return 0;
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}
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__initcall(leds_init);
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